Multicylinder engine.



E. G. GUNN.

MUL'HCYUNDER ENGINE. APPLICATION' FILED APR. 3, mls.

Patented Mar. 26, 1918.

EARL Gr. GUNN, F DE..ROIT, MICHIGANZ F ai.:

MULTICYLINDER ENGINE 'y, fff

Specification of Letters Patent.

To all 'whom l may concern.'-

` of aluminum.

. material is unsuitable for the same.

vthe valve seat-s. readily bushed with sleeves -of a suitable slightly Be it known that I, EARL G. GUNN,a citizen of the United States of` America, residing' at Detroit, 'in the county of Wayne and State of Michigan, have invented certain new and useful Improvements in Multi-l cylinderEngines, of which the following is a specification, reference being had therein to the accompanying drawings.l

The invention relates to multi-cylinder engines of the soi-called. L-type, and it is the object of the invention to facilitate the casting of the block and to permit. the form` ing of .the same out of different materials. In the present state of the art it is common to form multi -cyli1ider L-type motors en bloc, and for lightness these have been made It has been found difhcult, however, to yform the complex cored struc ture from such material, and further this wearing surfaces, such as theinner face 'of the cylinder and The cylinders can be wearing material, such as cast iron, but the bushing of each of the valve-seats would greatly complicate the structure; I have therefore devised la construction in which the cylinders and the L-eXtension thereof are made in separate sections, the cylinders being preferably formed of aluminum and the I -portions of cast-iron. tion of cast-iron for the latter part will but increase the weight and will' provide suitable material for the valve seats without the necessity of facing or bushing On the other hand, the casting y operation is greatly simplified, as the cores f r forming the water-jacket surrounding the cylinder are readily supported on the side which adjoins the L-section and the casting of the latter section is also simplified.

In the drawings:

. Figure l is a cross-section through lan engine embodying my invention;

g Fig. 2 is a plan View thereof with the head or cover-plate removed; and

Fig. 3 is a side elevation. A A, ete., are a plurality ofcylinders of The substitua multicylinder engine, which are cast en bloc. As shown the block includes in'addition to the cylinders and their water-jackets a portion B forming the upper section of the crank case, but the head C and L-section D are formed of separate members. This permits of supporting the cores for forming the annular chambers E ofthe waterjacket from the side which adjoins the eX- tension D. This side is provided with a marginal bearing portion F, which is machined for engagement Witha correspond ing marginal bearing Gr on the L-section, the parts being secured together by suitable means, such as studs H at distributed points in the area thereof. As has been stated the section D 'is preferably formed of cast-iron and is suitably cored to form the inlet and `rhaust ports I J and the water chamber surrounding the same and which communicates with the chambers E. The head D is extended to cover both the cylinder block and the L-extension.

With the construction as described the manufacturing cost vis reduced, and the advantage of the cast iron and the aluminum constructions are combined. Thusv by usin cast-iron bushings L for the cylinders, an

forming thev L-section of cast-iron good wearing surfaces for the working parts are obtained, while the use of aluminum for the greater portion of the structure reduces the weight over an all cast-iron construction.

Vhat I claim as my invention is 1. In an engine, the combination with a cylinder formed of a relatively light mate- .rial, of an LV-extension for said cylinder Patented Mai.`^26, i918. lipiieationieaiipprns,1916. s'eriainasasis. A

rial, common to all of said cylinders and formed ofa separate section attached directly thereto.

3. In an engine, the combination with a plurality of cylinders cast en bloc, of an l.-

oxtvnsion common to said cylinders, Separately formed und attached thereto, 'und 'a svpnrnto head covering' all of said cylindeiS and the L-extension thereof.

-l.. In an engine. tho combination with a ."cylinder'formed of zt relatively light inzit@- rinl provided with a Waiter jacket open at ing said open side of the cylinder Water jacket. i Y) In testimony whereof I affix my signature.

EARL G. GUNN. 

